- optimum dose,
- optimum population,
- option money,
Origin of optional
Examples from the Web for optional
Sure, taking sexy pictures—like having sex itself—is, technically speaking, optional.In Defense of Nude Selfies: Don’t Shame ‘The Fappening’ Victims|Amanda Marcotte|September 23, 2014|DAILY BEAST
Van Zant was echoing a growing sentiment of paranoia and fear sparked by the optional public education standards program.Fringe Factor: The Common Core Will Turn Your Kids as Gay as Possible|Caitlin Dickson|May 25, 2014|DAILY BEAST
When I ask why she wears a veil in a society where it's optional, Sakdiyah explains how it frees her.
Then you may be delighted to learn that the essay portion of the SAT is now optional.
It comes with matching headband, optional sleeve panels and petticoat.
After you have made this call, it is, to some extent, optional with you as to what further attentions you shall pay the party.
It should be imperative (not optional, as at present) for every vessel to carry a certain number of lifebelts.Saved by the Lifeboat|R.M. Ballantyne
The dimensions are optional, but boxes about two feet long, one foot wide, and five inches deep answer admirably.
This last is the optional rule of the American Episcopal Church.
At this time primary education was optional, given in private schools, aided in some cases by provincial grants.The Tribune of Nova Scotia|W. L. (William Lawson) Grant